Semiconductor AlGaN Gan Hemt Contact Resistance Calculator
Extract actual HEMT TLM single-contact intercept/2 and sheet slope×width from independently selected linear trace; signed nonphysical fit evidence retained, not forward transfer-length resistivity.
Description
A transmission-line-method trace separates a single-contact resistance contribution from a sheet-resistance slope.
A transmission-line-method trace separates a single-contact resistance contribution from a sheet-resistance slope.1
Its interpretation depends on matched contact width and independently selected linear measurements.
When to use Semiconductor AlGaN Gan Hemt Contact Resistance Calculator
Use this tool when you need to calculate the stated measurement summary or conditional model from matched observations. Prepare independently matched device or specimen measurements, units, branch selection, and model or calibration conventions.
How to use Semiconductor AlGaN Gan Hemt Contact Resistance Calculator and understand its results
- Prepare independently matched device or specimen measurements, units, branch selection, and model or calibration conventions.
- Enter observedTlmContactSeparationsM, observedTlmTotalResistanceOhms, observedContactWidthM, following the field table and calculation rules below, then run the tool.
- Read extractedSingleContactResistanceOhms, extractedSheetResistanceOhms, tlmFitRSquared. Use the output table and calculation rules below to interpret units, signs, crossings, and flags.
- Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedTlmContactSeparationsM | Observed TLM contact separations m | list of number | Required |
| observedTlmTotalResistanceOhms | Observed TLM total resistance ohms | list of number | Required |
| observedContactWidthM | Observed contact width m | number | Required |
Require positive contact width and nonnegative separation and total-resistance samples. Fit resistance against separation with a free intercept, then return half the intercept, slope times width, and R². Signed nonphysical fit parameters are preserved.
The regression helper accepts 2–10000 aligned finite pairs with nonzero predictor variance. It fits ordinary least squares with a free intercept using shifted coordinates; samples need not be sorted unless this tool additionally requires it. R² is clamped to [0,1] and is one for constant responses. Transformed fits use the stated log or reciprocal predictor/response basis; R² is a fit summary rather than a confidence interval.
Rtotal=a+b×separation; Rcontact=a/2; Rsheet=b×width Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| extractedSingleContactResistanceOhms | Extracted single contact resistance ohms | number |
| extractedSheetResistanceOhms | Extracted sheet resistance ohms | number |
| tlmFitRSquared | TLM fit r squared | number |
{
"input": {
"observedTlmContactSeparationsM": [
1,
2,
3
],
"observedTlmTotalResistanceOhms": [
3,
5,
7
],
"observedContactWidthM": 2
},
"output": {
"extractedSingleContactResistanceOhms": 0.5,
"extractedSheetResistanceOhms": 4,
"tlmFitRSquared": 1
}
}Limitations and assumptions
Measurements, branch identification, units, and model applicability must be independently established. Results do not supply universal material constants, a complete physical model, or operating-condition approval.
Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected. Arrays must be dense, with no missing cells. Numeric lists allow at most 10000 entries, subject to smaller tool-specific bounds above.
Alternative or Complementary methods
For a related task, use Semiconductor Cu Cu Bonding Resistance Calculator: Four-wire current-voltage records can separate a contact resistance slope from a voltage offset. Keeping the free intercept avoids treating every observed voltage as pure resistive drop. For a complementary step, use Semiconductor AlGaN Gan Hemt Sheet Resistance Calculator: Four-probe sheet-resistance extraction uses measured voltage and current with an independently verified geometry correction. That correction belongs to the supplied finite-sample arrangement.
References
Similar or alternative tools
- Semiconductor Cu Cu Bonding Resistance Calculator
Four-wire current-voltage records can separate a contact resistance slope from a voltage offset. Keeping the free intercept avoids treating every observed voltage as pure resistive drop.
- Semiconductor AlGaN Gan Hemt Sheet Resistance Calculator
Four-probe sheet-resistance extraction uses measured voltage and current with an independently verified geometry correction. That correction belongs to the supplied finite-sample arrangement.